Robtex

Up: 139.193.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 139.193.12.0/23
Down right: 139.193.14.0/23

IP	Type	Hostname
139.193.12.2	PTR	fm-dyn-139-193-12-2.fast.net.id
139.193.13.150	PTR	fm-dyn-139-193-13-150.fast.net.id
139.193.14.2	PTR	fm-dyn-139-193-14-2.fast.net.id
139.193.15.1	PTR	fm-dyn-139-193-15-1.fast.net.id
139.193.15.2	PTR	fm-dyn-139-193-15-2.fast.net.id
139.193.15.144	PTR	fm-dyn-139-193-15-144.fast.net.id